Telephone-receiver.



- S. S. SONNEBORN.

TELEPHONE BEOEIVER.

APPLICATION 211.121) mu 1a, 1909.

Patented July 12, 1910.

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SOL S. SONNEBORN, OF NEW YORK, N. Y.

TELEPHONE-RECEIVER aeaeea.

Specification of Letters latent.

Patented July 12, lore.

Application filed May 18, 1908. Serial-No. 433,600.

To all whom it may concern:

Be it known that I, Son S. Sonnnnonn, a citizen of the United States,residing at the city of New York, in the borough of Brooklyn and Stateof New York, have mvented certain new and useful Improvements 1nTelephone-Receivers, of which the following is a full, clear, and exactdescription;

This invention relates to telephone receivers, the principal objectbelng to improve the sensitiveness and efiiciency of instruments of thisclass, whereby better results can be attained with telephone systems,telemagnet does not to overcome these graphones, and other apparatuswhere telephone receivers are used.

The ordinary telephone receiver makes use of a single diaphragm ofmagnetic material which is vibrated by an electro-magnet in thetelephone circuit. It is found in practice that diaphragms of more thana certain size and thickness cannot be efficiently employed, but itfrequently happens that a diaphragm of this size with its correspondingutilize all the electrical energy of the telephone circuit. Moreover, inan ordinary instrument, the sound is taken from only one side of thediaphragm and the vibration transmitted to the air on the under side ofthe diaphragm is'practically wasted.

It is the purpose of my present invention drawbacks and providefareceiver in which diaphragms of the standard size and thickness may beemployed, but in which the full energy of the electrical circuit isutilized. With this object in view, I provide two separate diaphragmswhich vibrate in synchronism underthe influence of magnets in thetelephone circuit, and which are so arranged that the air vibrationsonboth sides of both diaphragms are combined into a single volume of soundat the earpiece of the instrument.

My invention further consists in the features of construction andcombination as hereinafter set forth and finally particularly pointedout in the appended claims.

In the drawings: Figure 1 is a vertical sectional view of atelephonereceiver embodying the principles of my invention; Fig. 2 is an end viewof certain of the interior parts; Fig. 3 is a vertical sectional view ofa modified form of the invention, and Fig. 4

is an end view of the same with the cap and diaphragm removed.

Referring to the drawings, in which like parts are designated by'thesame reference sign, 1 indicates a casing which may be of metal orinsulating material and which may form part of a fixed frame or support,or which may be the housing of a watch-form type of receiver, as in Fig.1.

2 designates an imperforate cap screwed on one open end of the casing 1,and 3 is a cap havlng a central perforation 4 and adapted to constitutean ear-piece. Within the casing 1 there is supported in any suitablemanner a magnet 5 having one or more pole pieces (Sand 6 projecting inopposite directions axially of the casing 1. I have shown a convenientmethod of mounting the magnet 5, and consisting in a plate or body 7 oinsulating material in which the magnet 5 is embedded, and which ismoldedinto the casing 1, the latter being beaded at 8 to afford a firmsupporting engagement. 9

designates magnet bobblns or windings which may be included in series ormulti arrangement in a telephone circuit.

The diaphragms are supported within the casing 1 in a special manner,constituting an important feature of my invention. In place of securingthe diaphragms closely within the casing, I provide cups or shells 10with screw caps 11 adapted to clamp and hold diaphragms 12 of theordinary ferrotype construction. Two of these cups or shells areprovided, and are assembled upon opposite sides of the plate or body 7so as to surround and inclose the magnet bobbins 9. For this purpose thecups are cut away at their lower faces and are assembled upon the magnetby fastening screws 13. In this relation the diaphragms 12 are held inclose but properly spaced-apart relation from the magnet poles 6, 6, soas to be in operative or telephonic relation therewith. The cups orshells 10 are not closely contained in the casing 1, but fit therein soas to leave a considerable annular space or passage 14 between theiroutside surfaces and the adjacent wall of the casing 1-. '15 designate aseries of perforations in the cups or shells 10 by which a freecommunication is established between their interiors and the spacevibrations directly to the ear of the operator,

from its upper face, and, at the same-time, the vibrations of the airbeneath this diaphragm are transmitted through the openlugs 15 of thischamber and around through the adjacent annular passage 14 to assist thevibratlons from the upper side of this diaphragm. I am aware of the factthat there may be aphase difference in the vibrations from the twosources, but I find in practice that, notwithstanding this theoreticalconsideration, the practical effect is to augment the sound whichfinally issues through the orifice 4. In exactly the same way the soundwaves are taken from the lower and the upper faces of the lowerdiaphragm 12 which is adjacent to the oles 6. This sound passes throughthe ad acent-openings 15 and the adjacent annular passage 14, upwardthrough the holes 17 and into the cavities already described, where itbecomes merged into the sound from the upper diaphragm 12. In this waythe sound received by the operator is compounded from four differentsources, the waves from which are merged together into a single volumeof sound. It is found in practice that, not only is the sound of greaterintensity, but of much greater purity, by virtue of this arrangement.

In Figs. 3 and 4 I have shown a slightly modified form of the inventionembodied in a bi-polar receiver of substantially standard form, insteadof the watch-form type of Figs. 1 and 2. In this case bar magnets 20 areemployed with soft iron polar extensions '21 and 21' at their respectiveends. 22 designates the magnet bobbins or windings which surround thepoles 21 in the usual manner.. I form the magnets 20 permanentl embeddedin the casing or housing 23 o insulating material, and which has achamber or cavity 24 at'eachendin which the dia hragm and the magnetbobbins are receive 25 designates holes or passages extending from endto end of the body or housing' 23 and which serve 'to put the cavities24 at the respective ends in free communication with one another. Theinterior walls of the cavities 24 are not made round and continuous, butare deeply notched or otherwise recessed or mutilated, as designated at26, at aplurality of. points spaced thereabout. Between the notches 26there is formed an annular cavity 27 in which is received a diaphragm28. 29 designates a clampin ring screwed into the threaded ortion o thecavity 27 to engage and holld. the diaphragrmf The construction of thearts at each end of the receiver is identical in'all respects, exceptthat at the lower end there is provided an imperforate cap 30 tocompletely inclose the chamber 24 at this end, while at the other end ofthe receiver there'is provided a centrallyapertured cap 31 ofsubstantially the ordinary form in a telephone receiver.

The operation will be suificiently understood from that of themodification reviously described. It is evident that the sound from bothsides of both diaphragms is combined and issues in a single volumethrough the opening of the upper cap 31. The notches 26 in this caseserve in place of the holes 15 and the assages escribed.

What I claim is 1. A telephone receiver comprising 9. diaphralgm, amagnet, a ring supporting said d ap ragm, and a casing surrounding saidring and ada ted to establish an annular space around t e same, saidspace establishing communication between opposite sides of thediaphragm.

2. A telephone receivercomprising a permanent magnet having a pluralityof poles, a plurality of diaphragms cotiperating therewith, a casinghavm a single ear-piece orifice, anda cup-shape art having perforationswhereby the sound vibrations from all of said diaphragms are combined toissue through said orlfice.

3. A watch-form ing a casing,'a therein and having oles, a plurality ofdiaphragms transverse y disposed to the axis of said casing, and membershaving perforations to permit the sound waves from both sides of both ofsaid'diaphragms to be combined.

4. A telephone receiver comprising a mag mg said poles, a casingsurrounding said cups and providing an annular space In conjunctiontherewit and diaphragms supported by said cups in proximity to saldmagnet poles.

5. A telephone receiver comprising a permanent magnet having a pluralityof oles, a plurality of diaphragms cotiperatingt erewith, a caslnghaving a single ear-piece orifice; and means whereby the soundvibrainternally threaded type of receiver comprispermanent magnetembodied III net having poles, perforated cups surroundtions from bothsides of all of said dia- Waves from both sides of all of saiddiaphragms are combined to issue through said phragms are combined. 10

orifice. In witness whereof, I subscribe my signa- 6. A watch-form typeof r eiv r compristure, in the presence of two witnesses.

ing a casing, a permanent magnet embodied SOL S. SONNEBORN.

therein and having poles, a plurality of dia- Witnesses:

phragms transversely disposed to the axis Jorm F. Boss,

of said casing, and means whereby the sound MICHAEL DocK'rER, J r.

